Hello I use Unity 4.0.0 and want to make an F.P.S. Can somebody provide me with a kit or something that all I have to do is drag into my scene, like a gun and enemies. I don’t care what they are like, but if possible mabey WWII guns. It is for personal use only, and as I am fairly new I don’t know how to do this. And how would I make it Multiplayer? Thanks! (I wont pay money)
Only kit I am aware of that is completely free requires Unity 5.5.
Outside of that I recommend checking FPS Creator but be aware it isn’t Unity and it is effectively abandoned.
If neither of these solutions are acceptable then you’ll have to (a) be willing to pay money, or (b) learn game development.
Why? Unity 5.x is superior in every way for personal use. And most kits have been upgrade to take advantage of changes in the 5.x series.
Upgrade to Unity 5 and use the Standard Assets FPS demos.
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I cannot update to unity 5 because my computer is horrible. If any of you have any experience with FPS games, could you send me a download of the character and gun scripts?
Unity 5 runs better than Unity 4, so you’re only handicapping yourself here.
Upgrade and download the free sample content.
I’m with LaneDix and Kiwasi on this - it would be much better to upgrade your PC first and get Unity 5.
However, having been severely short on funds in the past (and even now, still) I understand your dilemma. You could try looking for 3D models of guns and characters (if animated, then better) and make your own assets out of them - even learning Blender isn’t too hard for basic objects.
Plus there’s great tutorials on this site about creating game objects from models and stuff.
As for scripts - you MAY have to just do those yourself. Bear in mind that, again, there are some great tutorials on here to assist… but a lot of them are for later versions so you may have to grind it yourself.
Again, sorry to say but upgrading is the best option… Sorry 
HEWP ME PLS
I have figured it out, found something. One last question, what versions does unity multiplayer support? (of unity) and how do i implement it?
Only Unity 5 to my knowledge. You’ll want to look into a third party multiplayer solution like Photon for Unity 4.